CN103765793A

CN103765793A - Support for asynchronous time division duplexing in adjacent cells of wireless communication system

Info

Publication number: CN103765793A
Application number: CN201280042353.7A
Authority: CN
Inventors: A.马特塞夫; A.达伊多夫; G.莫罗佐夫; I.博洛廷
Original assignee: Intel Corp
Current assignee: Apple Inc
Priority date: 2011-08-12
Filing date: 2012-08-08
Publication date: 2014-04-30
Anticipated expiration: 2032-08-08
Also published as: EP2742619A1; CN103765968B; BR112014002694B1; WO2013025419A1; US9807723B2; KR20140042914A; KR101546203B1; US20130294390A1; BR112014002694A8; WO2013025237A1; RU2569932C2; WO2013025379A1; US20140177427A1; US20140003270A1; CN103891159B; RU2491628C1; CN103891159A; US10009864B2; RU2014107942A; JP2014522198A

Abstract

Technology is discussed for mitigating interference in a wireless communication environment where adjacent cells can have asynchronous Time Division Duplexing configurations. Measurements can be taken at an illuminated evolved Node B (eNodeB) of DownLink (DL) transmissions from a transmit eNodeB. These measurements can be relayed to the transmit eNodeB over a backhaul link and used to make scheduling, transmission power, and/or beam forming decisions to reduce the potential for DL interference. To reduce UpLink (UL) interference, sub-frame specific measurements can be requested by a transmit eNodeB of a User Equipment (UE) that would receive DL transmission from the transmit eNodeB to detect interference from any UEs performing UL transmission to an adjacent eNodeB. The interference measurements can be used by the transmit eNodeB to make scheduling determinations to mitigate the interference.

Description

Support to asynchronous time division duplex in the neighbor cell of wireless communication system

Related application

The application requires to have and proposes on August 12nd, 2011, and the priority of the U.S. Provisional Patent Application 61/523080 that is P39155Z in this attorney docket incorporated herein by reference.

Background technology

Wide area wireless network generally comprises for by being called the geographic area of community and cellular radio tower (tower) that wireless device communicates.Many radio communication standards adopt down link (DL) business of the one or more wireless devices that operate in time division duplex (TDD) the scheduling Cong Tadao community of a certain form.TDD is also for up link (UL) business from one or more wireless devices in the community of tower control by common frequency scheduling of resource.

Third generation partner program (3GPP) Long Term Evolution (LTE) standard provides an example of this type of standard of holding TDD.Another standard is Institute of Electrical and Electronics Engineers (IEEE) 802.16 standards that are commonly referred to WiMax.

For holding DL and the UL business in same community, can adopt TDD configuration.TDD configuration provides the different time-gap for UL and DL transmission with respect to common tower.By assigning UL and DL to be sent to different time-gap, can avoid otherwise transmit while occurring the destructive interference occurring at UL and DL simultaneously.

In wireless network, different towers can run into the different demands to DL and UL business.For example, may exist the more much bigger demand of DL business at a tower.And in adjacent towers, can there are the more demands to UL business with respect to the first tower.Therefore,, for improving efficiency, will wish to distribute more UL time for adjacent towers.Yet, will bring the risk that UL is transmitted be subject near the interference that the more powerful DL of former tower transmits self-moving device like this.

It is not that nearby tower has the interference that can become the unique type of problem in the situation that asymmetric UL and DL transmit configuration that down link transmits the interference cause.Another example of the interference of problem types is in the situation that tower is configured to receive UL from the wireless device that tower is associated therewith transmits and occur.Yet near tower is configured to provide DL to be sent to the other wireless device that near tower is associated therewith.If receive one or more wireless devices of DL transmission enough near the wireless device transmitting on UL, the UL from UL wireless device transmits the DL reception that can disturb other wireless device.

In addition, for improving spectrum efficiency, in the community that allows to cover at the high power cellular radio tower that can be called grand node (MCN) such as nearest wireless specification such as those standards for LTE, dispose low power nodes (LPN) cellular radio power station.LPN and MCN can be parts for heterogeneous network.The interference that can run into respect to these LPN in MCN community can be greater than the interference running in neighbor cell.

Accompanying drawing explanation

In conjunction with the following detailed description that the accompanying drawing of feature of the present invention is shown together by example, will understand the features and advantages of the present invention; And wherein:

Fig. 1 is block diagram, is illustrated in the network of enode b (eNodeB) tower in the wireless communications environment of the coverage cell with asymmetric directed business according to example;

Fig. 2 is according to the form of an example of possible time division duplex (TDD) configuration of example;

Fig. 3 is block diagram, according to example be illustrated in from the down link (DL) of an eNodeB transmit with from and up link (UL) transmission of subscriber equipment (UE) wireless device that is associated of another eNodeB between interference;

Fig. 4 is block diagram, according to example, illustrates from the resource element (RE) in the UL transmission of UE, and this UE and the eNodeB of reference signal (RS) in measuring from the DL transmission of DL eNodeB communicate, and wherein, RE is corresponding to RS;

Fig. 5 is block diagram, illustrates to use in the direction from DL eNodeB to exposure eNodeB disturb different TDD configurations for empty wave beam forms to be reduced according to another example;

Fig. 6 is block diagram, according to another example, illustrates because the UL from UE to UL eNodeB transmits, and in the DL transmission receiving, disturbs at the UE as by being associated with DL eNodeB;

Fig. 7 is block diagram, according to another example illustrate indication carry out subframe particular measurement time slot information execution and the relaying with those measurements be provided;

Fig. 8 is flow chart, according to another example, illustrates for measuring and transmit to reduce interference at the DL of exposure eNodeB in the situation that there is different TDD configuration;

Fig. 9 is flow chart, according to another example, illustrates for asking time slot particular measurement to determine and to respond the process of disturbing on the UE transmitting from the DL that transmits the UE that UL transmits receiving;

Figure 10 is block diagram, and according to another example, being illustrated in DL eNodeB and exposure eNodeB all can be at the device of measuring the possibility that DL disturbs and taking action use in the process avoiding interference, and wherein, two eNodeB have different TDD configurations;

Figure 11 is block diagram, according to another example, be illustrated in eNodeB and operate to coordinate in the execution that receives the subframe particular measurement of the UE that the DL that is associated with eNodeB transmits, determine and the device of response as the interference on UE that caused by the UL transmission from another UE to another eNodeB;

Figure 12 is flow chart, according to another example, another vague generalization process is shown to alleviate various types of may the interference being produced by asynchronous TDD configuration; And

Figure 13 is according to the block diagram of the UE of another example.

Now with reference to shown in example embodiment, and will use in this article language-specific to describe example embodiment.Yet, not it being understood that and therefore will limit the scope of the invention.

Embodiment

Before disclosure and description the present invention, it being understood that and the invention is not restricted to ad hoc structure disclosed herein, process steps or material, but can expand to if various equivalent modifications is by its equivalent of recognizing.Also it should be understood that the term adopting is only for describing the object of specific embodiment herein, and have no intention to limit.

Definition

The different terms of wireless device in different specification, have been used.While using in this article, wireless device can be subscriber equipment (UE) or travelling carriage (MS).The application in the whole text in, term UE can be used with term MS exchange.

While using in this article, cellular radio tower is in wide area wireless network, to be configured to be called the radio communication device that a plurality of wireless devices in geographic area of community communicate with being positioned at.The different terms of cellular radio tower in different specification, have been used.The term that is used for the difference variation of cellular radio tower can include but not limited to base station (BS) and enode b (eNodeB or eNB).Except as otherwise noted, otherwise, the commutative use of these terms.The actual definition of BS or eNB provides in its IEEE 802.16 and 3GPP LTE standard.General important statement as the embodiment discussing in present disclosure, although often use the term of third generation partner program (3GPP) Long Term Evolution (LTE) standard at this specification in the whole text, but it has no intention restriction, and have in this specification and use the exception of general term more further to express this viewpoint in part.

While using in this article, term " in fact " refers to the complete of action, characteristic, attribute, state, structure, project or result or is close to scope or degree completely.For example, by the object of " in fact " sealing, indicated object is sealed completely or is close to sealing completely.Can be depending in some cases specific context with the program that definitely can allow of definitely complete deviation.Yet, typically, approach the result that obtains when complete by as obtained definitely and thoroughly the total result completely time is identical." in fact ", to negate that connotation represents completely or is close to while lacking action, characteristic, attribute, state, structure, project or result completely, it uses same applicable.

While using in this article, term " adjacent " can represent contiguous, but also can represent enough to approach, and making the interference between adjacent element is a major issue, and no matter whether has any neutral element.

While using in this article, term " sky " can refer to full sky, but also can refer to the region that radiant power reduces.

Example embodiment

The initial general introduction of technology embodiment is provided below, and particular technology embodiment is described in further detail subsequently in the back.This initial summary is intended to help reader to understand quickly technology, and has no intention key feature or the essential feature of recognition technology, also has no intention to limit the scope of described theme.

Fig. 1 illustrates the example with the wireless communications environment 100 of asynchronous directed business demand or non-homogeneous cell load.Wireless communications environment 100 comprises a plurality of different districts 102-108.Each community comprises a geographic area, and in this region, corresponding enode b (eNodeB or eNB) 110a-110d can communicate with wireless device.

The eNodeB 110a-110d of various community 102-108 is configured to support up link (UL) and the down link (DL) of one or more unit of subscriber equipment in various respective cell (UE) 112a-112d to transmit.For holding UL and DL, transmit, wireless communications environment 100 rely on time division duplexs (TDD) separate from eNodeB to UE, be called transmission that DL transmits and from UE to eNodeB, be called the transmission that UL transmits.TDD can be used in and assigns UL and DL to be sent to different time-gap.By assigning UL and DL to be sent to different time-gap, can avoid the interference between transmitting.

Each community 102-108 comprises to and from a plurality of arrows that are positioned at the various UE 112a-112d of each community.The thin dotted arrow that points to eNodeB 110a-110d is illustrated in the mean time area of a room used in inherent UL transmission preset time.Similarly, the thick solid arrow that points to UE from eNodeB be illustrated in preset time inherent DL transmit the mean time area of a room used.Therefore, the relative populations of UL arrow and DL arrow is illustrated in the relative quantity of the directed business that DL and each community 102-108 of UL transmission aspect run in amount in preset time.

The general version of OFDM (OFDM) that uses of TDD communication completes.DL in TDD communication transmits and directly by OFDM scheme, realizes.UL transmits by single-carrier frequency division multiple access (SC-FDMA) modulation scheme and realizes.Because SC-FDMA only relates in the front other discrete Fourier transform (DFT) of conventional OFDM (OFDMA), therefore, SC-FDMA can be regarded as linear predictive coding OFDMA scheme.In addition, because OFDMA is multi-user's version of OFDM, therefore, SC-OFDMA is the version of OFDM, and has the resource element with respect to the time identical with OFDM and frequency definition.

In OFDM, the communication resource that can be called time slot in TDD can be assigned to up link or down link.With respect to two other communities that are shown 104,106, be shown two examples of 102,108 and run into obviously larger DL business load.In measuring preset time, each community can run into DL and the directed business of UL of different amounts.Therefore, effective use of time resource will determine that each community is to being exclusively used in UL and transmitting and the use of the time slot of the difference amount of DL transmission.In measuring preset time, the time slot of varying number can be regarded as TDD configuration to the distribution of DL and the directed business of UL.

Fig. 2 illustrates the form 200 of possibility TDD configuration according to cordless communication network example.This example has no intention to limit.If understand, depending on network configuration, network working load and further feature, can use a plurality of different TDD configurations.Form is depicted as the TDD configuration of the 9th edition appointment of third generation partner program (3GPP) Long Term Evolution (LTE) standard.Yet other scheme of TDD configuration is possible.

In form 200, each configuration of 7 TDD configurations takies a frame, and this is corresponding to the delivery time of 10 ms.After transmitting at frame the time warp requiring, can repeat selected TDD configuration.Each frame can comprise 10 1 ms subframes.Each subframe can be corresponding to a time slot.

Correspondingly, each subframe can be divided and is used in the DL transmission that the UL that illustrates by " U " in Fig. 2 transmits or illustrates by " D ".During some subframe also can be divided the specific transmission being used in by " S " indication, during those transmission that transmit for down link pilot timeslot (DwPTS), guard period (GP) and uplink pilot time slot UpPTS.If understand the same, each TDD configuration transmits corresponding to DL and UL the different mode distributing, with transmit the distribution of the difference amount transmitting for UL with respect to DL.These different modes cause the possible interference type between the neighbor cell of the eNodeB with containing different TDD configurations.

Fig. 3 illustrates an example 300 of the interference of a type that can produce from different TDD configurations.In example, the part of grand node (MCN) eNodeB 302 its overlay areas (that is, community) 304 has comprised low power nodes (LPN) eNodeB 306.LPN can but to be not limited to be that the eNodeB of covering can be provided in smaller managing Huo little community, region.LPN can be Microcell, picocell, Femto cell, the eNodeB of family community (HeNB), long haul radio head end (RRH), remote radio devices (RRE) and transponder.LPN eNodeB has its oneself LPN overlay area (community) 308 in the overlay area of MCN eNodeB.

In example 300, MCN 302 disposes the TDD configuration 310 that configures 4 specific to MCN and corresponding to the TDD in the form 200 of Fig. 2, and LPN 306 disposes the TDD configuration 312 that configures 3 specific to LPN and corresponding to TDD in form.As shown in the coarse contour of these subframes of two different TDD configurations, these two form configurations have the difference distribution for DL and UL transmission in subframe 4.

During transmission when subframe 4 is respectively two eNodeB execution transmission, MCN 302 and LPN 406 have been shown in Fig. 3.According to TDD configuration 4, MCN eNodeB, carrying out by thick solid arrow indication, will transmitted by the DL of UE 314 receptions that are associated with MCN.Similarly, LPN receives by thin dotted arrow indication, from the UL of the 2nd UE 316 being associated with LPN, transmits.

Yet, unfortunately, as shown in the thick solid arrow 318 by from MCN 302 to LPN 306, from the DL of MCN, transmit and can in LPN overlay area 308, there is the higher-wattage with respect to UL delivering power, a part for this overlay area is positioned at the overlay area 304 of MCN.The power transmitting from the DL of MCN can be recently much more powerful from the less UL of UE.As shown in " X " in the UL transmission from the 2nd UE 316, DL can transmit and cause sizable interference the UL of the 2nd UE.

Although Fig. 3 illustrates the example 300 with heterogeneous wireless network environment, wherein to the UL of LPN 306, transmit sizable interference that the DL of the MCN 302 that runs into carry different TDD configurations transmits, but the interference of this type also can be similar to those interference of Fig. 1, occur between the MCN of neighbor cell.UE sends UL from the border with another community and transmits, and in another community, when corresponding MCN is configured for DL transmission simultaneously, situation is especially like this.Therefore the type of, disturbing shown in Fig. 3 is applicable to foreign peoples and homogeneous network.In addition, this type of DL disturbs by than the even more high power node of those elements shown in Fig. 3 and low power nodes element, makes heterogeneous environment become more complicated.

For solving the needs of non-homogeneous UL and DL load in the community be contained in adjacent towers in TDD environment, need in neighbor cell, to support that different TDD are configured to hold new departure and the agreement of the directed business of asymmetric UL/DL.These new methods and agreement need firm and reliable.In addition,, in the infrastructure and hardware that is pre-stored in and/or is about to occur in utilization, they need to hold demand and the change of increase.

In the DL that solves this first kind disturbs, as received that at LPN 306 318 the DL from MCN 302 transmits, can be regarded as the radio link between MCN and LPN.LPN can measure the intensity that the DL from MCN as received at LPN transmits.For carrying out this, measure, LPN can measure the intensity that DL transmits interior one or more reference signals (RS).RS can include but not limited to the specific RS of channel condition information RS (CSI-RS) and community (CRS) defining in the 10th of 3GPP LTE standard the edition.LPN also can adopt the channel measurement for other form of link, comprises CQI (CQI).

LPN 306 can carry one or more MCN 302 that measure by back haul link 320.Back haul link can comprise X-2 interface.In addition, back haul link can comprise low latency link, as the broadband connections of fiber optic cables, broadband cabled cable or other type.The frequency of disposing this type of low latency cable in wireless network is increasing.Significantly the increasing of the available bandwidth of this type of low latency cable can be used in by enough frequencies send this type of measure and other for information about so that the relevant nearly real time information of interference that provides it to cause in the region of LPN for MCN does not make back haul link overload.

LPN 306 also can generate interference message, and indication needs MCN 302 with respect to taking action as received that at LPN 318 DL transmits.Except other possibility, this type of interference message also can include but not limited to such as the main eigenvector of quantification of the channel of channel measurement, Reference Signal Received Power, estimation and the information such as precoding matrix indicators of code book.

For helping the DL obtaining from MCN 302 at LPN 306 to transmit 318 Measurement accuracy, LPN can ask the one or more UE in its overlay area 308 to carry out silent mode.For example, can ask the 2nd UE 316 shown in Fig. 3 to carry out silent mode.Silent mode can be configured to transmit 318 those times of its measurement and time durations and the frequency of frequency at the DL that carries out MCN corresponding to LPN, and the UL from one or more UE is transmitted quiet.Like this, from the transmission of one or more UE, be configured to avoid causing the interference of the RS transmitting with MCN DL, so that LPN can measure accurately.These are measured accurately and can be used in the impact that is reduced in the UL transmission that LPN receives any interference that the DL from MCN transmits.

Measure accurately and can be used in that identification power reduces, spatial beams is redirected or when to can be used in the interference of receiving at LPN during the TDD time frame that is reduced in selection at the resource element (RE) of the selection such as the contour power node of MCN quiet.In another embodiment, can revise from UE and send to the interference that one or more uplink signals of eNodeB are received to be reduced in eNodeB such as high power node or LPN.

Fig. 4 illustrates consistent with some example, and the power that will apply at one or more UE reduces an example of pattern 402.Power shown in Fig. 4 reduces pattern with respect to illustrating with adopting the 10th edition consistent subframe 400 of 3GPP LTE of OFDM (OFDM) modulation scheme.Yet, can realize the power consistent with any amount of wireless specification and reduce pattern, and Fig. 4 is as example and unrestricted providing.The power that RE 402 can reduce broadcast to be reduced in exposure (illuminated) eNodeB(, the eNodeB that UE is communicating with it) interference of receiving.This specification represents to receive from the DL transmission of adjacent eNodeB or the eNodeB being irradiated by this transmission to quoting of " exposure eNodeB " in the whole text.Alternative, can RE 402 is quiet, allow thus exposure eNodeB to receive DL signal during the TDD time frame of selecting and without the interference from adjacent high power node.This will discuss below more comprehensively.

Subframe 400 is divided into distinct symbols row (0-13 with respect to the time, for ease of explanation, symbol rank 0 is numbered 404), and be divided into 12 capable (subcarrier 0-11 of different subcarriers with respect to frequency, for ease of explanation, subcarrier capable 0 is numbered 406), to form the graticule mesh of RE, and for ease of explanation, its specific RE 408 is shown with two-way diagonal angle cross-hauling.Each RE can carry the symbol of a modulation.Depending on modulation scheme or the reference signal of employing, the symbol of each modulation can carry one or more bits of data.Subframe can be associated with more or less subcarrier, but 12 subcarriers are shown in Figure 4, as the subcarrier of this quantity, in 3GPP LTE the 10th edition, is associated the same with Resource Block (RB).In 3GPP LTE the 8th, 9,10 and 11 editions, each subframe comprises a plurality of RB that wherein have a plurality of subcarriers.

In LTE heterogeneous network, as in other wireless standard, can transmit with respect to the synchronous UL of various eNodeB and DL.Therefore, at an eNodeB, with the RE of specific delivery time and sub-carrier frequencies scope, can there is the corresponding RE with similar delivery time and subcarrier at adjacent eNodeB.By parity of reasoning, in transmitting, for measure UL that the RS of intensity that DL transmits and/or other attribute can receive from one or more UE at exposure eNodeB at exposure eNodeB, transmits and have corresponding RE from the DL that transmits eNodeB.This specification represents to transmit to quoting of " transmitting eNodeB " eNodeB that the DL that may disturb in the transmission of another eNodeB transmits in the whole text.For the DL measuring exactly from adjacent transmission eNodeB transmits, eliminating potential interference can be helpful, the UL signal from UE of receiving at eNodeB when DL transmits as received at exposure eNodeB.By may be quiet and these UL signals are quiet by means of physics UL shared channel (PUSCH), can alleviate in the DL from adjacent transmission eNodeB transmits on the RS that will measure the interference that the UL from UE transmits.

In the example of Fig. 4, show the 8th edition to the 10th edition any version definition as 3GPP LTE, for the subframe 400 of physical uplink link sharing channel (PUSCH).Also can be that the power of silent mode reduces UL that pattern 402 can be applied to UE and transmits to reduce or eliminates when exposure eNodeB measures DL transmission the interference at time/frequency.Reduce/quiet the RE that can be applied to corresponding to same frequency/time location of RS in DL transmission of power.

Because RS repeats with common mode to another subframe from a subframe, therefore, in UL from one or more UE transmits the power of RE reduce/quiet can be also periodically, to alleviate the interference during the measurement of exposure eNodeB.In Fig. 4, the various UE the PUSCH of arrow points from one or more UE to exposure eNodeB transmits.RS pattern during pattern can transmit corresponding to DL.As shown in different cross-haulings in these RE, can be corresponding to the combination of different RE patterns and/or pattern for transmitting the difference transmission configuration of the interference signal of eNodeB.

Relevant RS pattern and/or to transmit the information of the pattern of eNodeB can be by exposure eNodeB priori known and/or be delivered to exposure eNode by back haul link.Exposure eNodeB can be delivered to one or more UE as power reduction/silent mode 402 using this pattern subsequently, to avoid time and the frequency of carrying out its measurement at exposure eNodeB to disturb from the transmission of these UE.In adopting the embodiment of LTE wireless system, exposure eNodeB can but the radio resource that is not limited to be provided for one or more UE is controlled (RRC) signaling, / power quiet to indicate reduces and should on which RE in the UL subframe of selecting, apply, and comprises the periodicity of this type of subframe.RRC signaling can comprise in silent mode or subframe will reduce/quiet RE collection.In other words, RRC signaling can be indicated in a Physical Resource Block of suitable subframe will by which RE power quiet or reduce, and this can periodically repeat.

Once the measurement of down link signal is carried out, can make relevant whether must taking and move with determining of disturbing in exposure eNodeB reduction.This determines and can make and be transported to transmission eNodeB at exposure eNodeB.This determines also and can transmit eNodeB by carrying out based on exposure eNodeB and making from the information that exposure eNodeB is transported to the measurement that transmits eNodeB.As previously described, measurement can be transported to and transmit eNodeB from exposure eNodeB through back haul link.When definite needs take action to disturb to reduce, can adopt several schemes.

Fig. 5 illustrates and adopts wave beam to form the scheme 500 to disturb in the reduction that receives the direction formation radiant power reduction of the wireless device that may disturb.In Fig. 5, the DL that transmission/DL MCN eNodeB 502 carries out the interior one or more UE 514 of a part of the overlay area 504 of arriving MCN transmits (thick solid arrow).LPN eNodeB 506 is also in this overlay area of MCN.In a further embodiment, LPN can be MCN, and the UL that is configured to receive from UE 516 transmits (thin dotted arrow).

With respect to the TDD configuration at MCN 502 and LPN 506, show during subframe 4 that down link from MCN 502 transmits and transmit from the UL of UE 516.Due to the TDD configuration 3 of TDD configuration 512 forms 200 corresponding to Fig. 2 of LPN, and the TDD of MCN configuration 510 configurations of the TDD corresponding to form 4, therefore, direction of transfer is in subframe 4 differences.Like before, in certain embodiments, LPN can be adjacent MCN.In addition, many eNodeB can receive the interference from a DL eNodeB.This specification represents to transmit the eNodeB that may disturb in the movable DL transmission of another eNodeB to quoting of " DL eNodeB " in the whole text.Yet in Fig. 5, the formation of MCN application of beam be take in the direction formation radiant power reduction of LPN or is empty beam pattern 522.In the direction of LPN, reduce or alleviate for empty radiant power can be used in the interference potential that transmits, transmits from the DL of MCN with respect to the UL of UE 516 at LPN.

For ease of explanation rather than restriction, the embodiment consistent with the aspect of the 10th edition standard of 3GPP LTE can utilize automatic neighborhood function (ANRF) to obtain E-UTRAN community global identifier (ECGI) to determine the direction that reduces radiant power.The information obtaining during the setting of X2 interface also can be used in be identified for beam pattern 522 for short side to.Beam pattern can form by any method of the Beamforming Method of stating in various radio communication standards, comprises those methods for 3GPP LTE the 8th to 10 editions.

In certain embodiments, be only that the measurement of carrying out at LPN 504 indicates the subframe of quite large interference to form beam pattern 522.In alternative, can form more at large beam pattern, covering may not need it time interval.The measurement of receiving from LPN 506 in addition, can be used in the change of carrying out TDD configuration 510 at MCN 502.As defined in 3GPP LTE the 10th edition, measure also to can be used in the conflict subframe phase and reduce the gross power transmitting, and generate almost blank subframe (ABS).

In addition, response is received from LPN 506 one or more measure as the definite part of scheduling done of MCN request or MCN 502, can application of beam formations, any combination of the technology noted earlier of TDD configuration change, gross power reduction and ABS transmission.For making this type of scheduling, determine, MCN can rely on the interfere information of receiving from LPN by back haul link 520.Interfere information can provide the information about the channel condition information on DL between MCN and LPN as in LPN measurement.Yet the interference that UL is transmitted being caused by strong DL transmission signal is not the interference of unique kind that different TDD configurations can cause in neighbor cell.

Fig. 6 illustrates due to different TDD configuration reasons can transmit from the UL from UE the example 600 of another interference type causing.Fig. 6 also illustrates transmission/DL MCN eNodeB 602 of the DL transmission (thick solid arrow) of carrying out one or more UE 614.Similarly, Fig. 6 is also illustrated in the LPN eNodeB 606 in the part of overlay area 604 of MCN.LPN also transmits at the UL receiving from UE 616.Due to the conflict direction of transfer of the TDD configuration 610 of MCN and the TDD configuration 612 of LPN, the UL receiving at LPN transmits the interference that also can run into from the DL transmission of MCN.Yet in Fig. 6, the UL that focus concentrates on from UE 616 transmits and can cause interference to the reception of the DL transmission at UE 614, " X " on the arrow being transmitted by the DL for from MCN indicates.

Although the UL transmission from UE can be recently more weak from the DL of eNodeB transmission, they still can cause interference to being positioned at the reception of another UE of the hundreds of rice that transmits UE.While using in this article, term " UL transmits UE " assignment be set to select time interval send UL signal to the UE of node.Term " DL receives UE " assignment be set to select time interval receive the UE from the DL signal of node.

Because UL in Fig. 6 transmits UE 616, enough near DL, receive UE 614, therefore, UL and DL are transmitted in the same time phase while occurring, and the UL that transmits UE from UL transmits can disturb at DL and receives the DL transmission that UE 614 receives.Yet, if UL transmits UE and DL receives UE at a distance of enough far away, generally have minimum interference, and no matter whether direction of transfer is different.Therefore, on another eNodeB, (particularly in the heterogeneous network with many adjacent eNodeB) exists in each subframe of conflict DL direction of transfer, eliminates DL and receives the DL transmission of UE and/or the subframe efficiency deficiency that can become.

Fig. 7 illustrates the subframe certain interference of carrying out for the one or more UE based on being disturbed impact and measures, and avoids that each DL is received to UE and is considered as receiving the inefficient scheme 700 that transmits the interference of UE from UL.In Fig. 7, such as the contour power node of MCN 702 (in alternative, MCN can be LPN), by means of back haul link 720, communicate with the LPN 706 in a part in its overlay area 704.If understand, back haul link can, as all other back haul links in this application, be the low latency link of fiber optic cables, coaxial cable or other type.

In the example of Fig. 7, LPN 706 can transmit its TDD configuration 712 by back haul link 720.MCN 702 can receive the TDD configuration of LPN, and it is configured to 710 with the own TDD of MCN compares.MCN can be identified in and carry out the same time/frequency of measurement with the subframe collection of the different directions transmitting, that is, and and the subframe 4 in the TDD of Fig. 7 configuration 710 and 712.It is former thereby have in the subframe in the subframe collection of conflict possibility and carry out subframe particular measurement due to the direction of transfer of conflict in subframe 724 grades such as identification that MCN also can ask one or more UL to receive UE 714.MCN receives these subframe particular measurement that receive UE from one or more DL subsequently.

In certain embodiments, the measurement that DL reception UE 714 carries out can comprise CQI (CQI) measurement 726.Yet, such as the measurement of other types such as channel condition information (CSI), be also possible.Although CQI measures can be scheduled to across whole frame and carries out, on average, for the value of independent subframe, in the embodiment that adopts one or more CQI to measure, MCN 702 can ask to carry out the specific CQI of one or more other subframes and measure.As shown in Figure 7, one or more CQI measure in such as Fig. 7 subframe 4 grades and carry out in the subframe during subframe with the different direction of transfers that transmit for UL and DL.MCN can receive the one or more CQI measurements that receive UE from DL subsequently.

MCN 702 can be used one or more CQI to measure 726 to avoid during the subframe of one or more selections subsequently, and the DL that is dispatched to particular UE transmits, wherein, during the subframe of those selections, from the subframe interferometry of this UE higher than threshold level.At the UL signal from adjacent UE and from the interference between the DL signal of LPN or MCN during not higher than threshold level, although there is the conflict TDD configuration for given subframe at the UE selecting, MCN can dispatch DL and transmit.MCN can determine based on make its scheduling from the measurement of a UE or a plurality of UE.MCN can propose by enough frequencies its request, to adapt in real time in different UEs owing to responding the interference rank that the directed business load of changing at various adjacent eNodeB is former thereby change.Also can apply various process to solve due to the various types of interference that cause at the different TDD configuration reason of one or more adjacent eNodeB.

Fig. 8 illustrates for the measurement by exposure eNodeB and alleviates the process 800 of disturbing from the transmission of DL.Method is included in exposure eNodeB and receives while transmitting from the DL of an eNodeB transmission, measures 810 these DL and transmits.In addition, an eNodeB transmits 820 to the one eNodeB by one or more measurements from exposure eNodeB.Subsequently, an eNodeB, according to the value of the measurement at exposure eNodeB, takes to move 830 to reduce interference.

Fig. 9 illustrates for by the measurement on the influenced UE of one or more possibility, alleviates the process 900 of the interference transmitting from UL.Method comprises that by DL, transmitting eNodeB indicates the 910 one or more UE that are associated with this eNodeB to carry out subframe particular measurement.The subframe of request is measured can be for asking with the subframe of different direction of transfers at adjacent eNodeB.In addition, DL transmits the scheduling that eNodeB change 920 transmits for the DL at least one UE, to avoid the subframe with the unfavorable measurement of the UE from responsible those measurements.Except various processes, can apply different device and disturb to solve asymmetric TDD.

Figure 10 is illustrated in and transmits the device 1021 of eNodeB 1020 and at the device 1003 of exposure eNodeB 1002.Each eNodeB can be configured to help to be reduced in DL in asymmetric TDD environment and transmit 1001 interference that cause.At the device 1003 that can be regarded as the exposure eNodeB of an eNodeB, comprise measurement module 1004, message module 1006 and communication module 1008.Measurement module can be configured to measure the interference transmitting from DL.DL transmits can be from transmitting or the 2nd eNodeB 1020.The DL that can measure as received at first/exposure eNodeB 1002 transmits.

Message module 1006 communicates with measurement module 1004, can be configured to generate interference message.By providing with respect to the known any type of information of other figure discussion and/or various equivalent modifications herein, interference message can be indicated needs second/and transmit eNodeB 1020 reduces and disturbs during the TDD subframe of selecting.For example, can reduce interference by change scheduling method.By from second/transmit the beam pattern that the direction radiant power rank of eNodeB to the first/exposure eNodeB reduces, or discuss and/or known any other scheme of various equivalent modifications with respect to other figure herein, also can reduce interference.Interference message also can be carried by second/transmission eNodeB 1020 and be can be used in and help to reduce the information of disturbing.The type of information will be discussed in paragraph subsequently.

In addition, communication module 1008 communicates with message module 1006, can be configured to transmit interference message.Communication module can be delivered to second/transmission eNodeB from first/exposure eNodeB by interference message.Interference message can allow second/transmission eNodeB to be reduced in the interference that first/exposure eNodeB receives.

In certain embodiments, measurement module 1004 can be by measuring one or more reference signals, measure channel state information.These reference signals can comprise channel state information reference signals (CSI-RS) and/or cell specific reference signal (CRS).In certain embodiments, interference message can comprise any channel measurement, precoding matrix indicators of eigenvector as main in the quantification of the channel of interference signal received power, estimation and code book etc.

In certain embodiments, communication module 1008 also can be configured to receive metrical information.Metrical information can provide the information of RS collection in the relevant transmission of the DL from the 2nd eNodeB.Metrical information can be used in searches RS collection, and measures the channel condition information that the DL from the 2nd eNodeB as received at an eNodeB 1002 transmits.

In certain embodiments, also can comprise the Coordination module 1010 communicating with measurement module 1004.Coordination module can be configured to the UE reduction delivering power that request is associated with an eNodeB.UE can requestedly be reduced in the power of measuring for UL during the measurement of the transmission of the DL from the 2nd eNodeB as received at an eNodeB.Like this, can alleviate during measuring the impact that the UL from UE transmits.

In this type of embodiment, the delivering power that Coordination module 1010 can transmit the UL for a RE collection by request UE is quiet, and request UE reduces delivering power.Those delivery times of the 2nd RE collection that these RE can will measure with the measurement module 1004 at first/exposure eNodeB 1002 and subcarrier be delivery time and subcarrier in fact similarly.In a further embodiment, communication module 1008 also can be configured to the TDD configuration information for first/exposure eNodeB to send to second/transmission eNodeB 1020.The one eNodeB is when subframe/RE receives UL information, and the TDD configuration that sends to the 2nd eNodeB can allow the 2nd eNodeB in the subframe of selecting, the OFDM/SC-FDMA symbol of selecting in the PRB of selection, subframe or the RE of selection do not transmit DL information and/or reduce delivering power.

In addition, in certain embodiments, measurement module 1004 can be carried out a series of measurements that DL transmits.Message module 1006 can generate a series of interference message.And communication module 1008 can send this serial interference message.By enough frequencies, take all these actions, to allow the 2nd eNodeB to adapt in real time the business load configuration in an eNodeB change.

With respect to second/transmission eNodeB 1020, the device 1021 above it can comprise backhaul module 1022, determination module 1024 and reduce module 1026.Backhaul module can be configured to receive the interfere information from exposure eNodeB 1002.Interfere information can provide relevant for as the DL from transmitting eNodeB that receives at exposure eNodeB transmit the information of 1001 channel condition information.

Determination module 1024 communicates with backhaul module 1022, can be configured to determine disturb reduce action.The interfere information that determination module is received based on backhaul module, determines violate-action.The reduction module 1026 that can communicate with determination module can be configured to take disturb reduce and move.Reduce module when determination module determines that interference reduction action is suitable, take to disturb to reduce and move.

In certain embodiments, reduce action and can be included in transmission eNodeB scheduling DL transmission subframe.DL transmits subframe and can be scheduled to avoid the DL in UL transmission at exposure eNodeB to disturb.In certain embodiments, backhaul module 1022 also receives the TDD configuration information for exposure eNodeB.The time scheduling DL that this information can be used in the reception transmitting at the UL not disturbing at exposure eNodeB transmits.

In certain embodiments, also can comprise that the wave beam communicating with reduction module 1026 forms module 1028.Wave beam forms module can be configured to be formed for the wave beam that DL transmits.The time of the reception transmitting at first/exposure eNodeB UL in interference such as the RE such as in TDD subframe or those TDD subframes, wave beam can have the radiant power of reduction from second/transmission eNodeB 1020 to the direction of first/exposure eNodeB 1002.In this type of embodiment, wave beam form module can due to two

eNodeB

1002 and 1020 and/or the UE that is configured to communicate from eNodeB is used the former of different TDD configurations thus the TD subframe of the selection that can occur to disturb during use ZF, least mean-square error (MMSE), signals leakiness noise ratio (SLNR) and/or Signal Interference and Noise Ratio (SINR) to be reduced in from second/to transmit the radiant power of the direction of eNodeB to the first/exposure eNodeB.

Depending on embodiment, second/transmission eNodeB 1020 and/or first/exposure eNodeB 1002 can be any eNodeB in high power eNodeB and low-power eNodeB.In addition, in certain embodiments, backhaul module 1022 can be configured to respond a series of interference message.Backhaul module can be made response by enough frequencies, to allow transmitting eNodeB, adapts in real time in the business load of exposure eNodeB change and the TDD configuration of change.

Although

device

1003,1021 is shown and is positioned on corresponding

eNodeB

1002,1020 in Figure 10, this has no intention to

limit.Device

1003,1021 can be in the position different from eNodeB, and can be configured to communicate with eNodeB.For example, device can be arranged in the evolution block core (EPC) communicating with the residing radio access network of eNodeB (RAN).

Figure 11 is illustrated in the device of the DL eNodeB 1102 that can reduce the interference transmitting from UL in asymmetric TDD environment.What be associated with DL eNodeB is that DL transmits the UE 1104 that 1106 part expection will send to.Device can comprise comparison module 1108, request module 1110, receiver module 1112 and scheduler module 1114.Comparison module can be configured to comparison in a TDD configuration of DL eNodeB and configure at the 2nd TDD of UL eNodeB.This specification represents to receive the eNodeB from the UL transmission of one or more UE of being associated to quoting of " UL eNodeB " in the whole text, and UL transmits the interference that can run into from the DL transmission of another eNodeB.In addition, comparison module can be configured to identify possibility interfering subframe.The subframe of identification may cause interference due to different UL and DL configuration reasons between configuring from the 2nd TDD in a TDD configuration.

Request module 1110 can communicate with comparison module 1108, can be configured to request receiving and carry out the measurement of subframe certain interference with the UE 1104 that a TDD configures the DL transmission 1106 being associated.Subframe certain interference is measured and can in the possible interfering subframe of comparison module identification, be carried out.In addition, the subframe certain interference that request module can be configured to receive from UE is measured.In certain embodiments, request module request is measured specific to the CQI of possibility interfering subframe.

In certain embodiments, can comprise receiver module 1112, this module can communicate with comparison module 1108.Receiver module can be configured to receive the information of relevant the 2nd TDD configuration.In a further embodiment, request module 1110 can provide by enough frequencies a series of requests that the subframe certain interference at UE 1104 is measured, to adapt in real time the interference rank of change.

In addition, in certain embodiments, can comprise scheduler module 1114.Scheduler module can communicate with request module 1110.Scheduler module can be configured to measure in subframe certain interference the DL transmission of avoiding being dispatched to UE in the possible interfering subframe higher than threshold level.Threshold level can be arranged to other quality control tolerance that meets certain quality of service (QoS) or state in the codes and standards corresponding to related embodiment.In certain embodiments, a plurality of subframe certain interference of scheduler module based on for a plurality of UE are measured, and make scheduling and determine.

Figure 12 illustrate for alleviate TDD environment and the flow chart of the method 1200 disturbed between transmitting of the UL that is associated of a plurality of eNodeB and DL.Method can but not necessarily need to be embedded in and comprise that nonvolatile computer can use in the computer program of media.In computer-readable media, can include computer readable program code.Computer readable program code can be applicable to carry out to realize the instruction for method.

Method can comprise with respect at least one interferometry, takes the first action and the second action.The first action and the second action produce on the basis that determines chain.Decision chain first determines whether 1210 methods realize at exposure/UL eNodeB.Exposure/UL eNodeB receives from the uplink signal of UE with from the eNodeB of the down link signal of adjacent eNodeB in single TDD subframe.As previously described, down link signal can disturb the uplink signal of receiving from UE.In certain embodiments, method can be measured to be identified in the signal strength signal intensity that the DL from one or more adjacent eNodeB that exposure eNodeB receives transmits by execution and realizes.In this type of embodiment, at measuring-signal, with the intensity higher than certain threshold value, index signal can affect in the situation of a certain quality control tolerance, and the method for can determining realizes at exposure/UL eNodeB.For determining whether the another program in exposure/UL eNodeB implementation method, determining can be based on receiving the time method that realizes in interval of distribution for UL.

What make, determine that 1210 is methods realize in the situation that on exposure/UL eNodeB, by generating 1220 one or more interferometries, take the first action.Interferometry is being from the UL of UE, to receive exposure/UL eNodeB generation of configuration.Interferometry can provide the information of the measurement that the DL of the adjacent eNodeB of the relevant DL eNodeB that calls oneself receiving at exposure UL eNodeB transmits.Subsequently, by interferometry is sent to 1230 to DL eNodeB from exposure eNodeB, take the second action.

Determining that 1210 is methods 1200 do not realize in the situation that on exposure/UL eNodeB, making method whether on transmissions/DL eNodeB definite 1240 of realization.Transmission/DL eNodeB transmits by DL the eNodeB that sends to UE, but due to the cause of failures from sending the adjacent UE of UL transmission, UE is difficult to receive DL and transmits.In certain embodiments, in the situation that method does not realize on exposure/UL eNodeB, can on transmission/DL eNodeB, realize by assumption method.In a further embodiment, based on method for DL, transmit to distribute time realize in interval, can draw certainly and determine.The report of TDD configuration based on from one or more adjacent eNodeB and/or a plurality of UE that are associated with those eNodeB, can suppose or can draw the interference potential that is transmitted in UE from the UL of adjacent UE.These TDD configurations and report can be collected and from exposure eNodeB, be delivered to transmission/DL eNodeB by one or more back haul links at exposure eNodeB.

What show that method 1200 realizes on transmission/DL eNodeB, certainly determine 1240, and when the UL that has the adjacent UE transmitting from the UL that carries out another adjacent UL eNodeB transmits, in the situation that be configured to receive the UE that DL transmits, there is interference potential, based on this, determine, take the first action.In such cases, the first action comprises by DL eNodeB and asks 1250 subframes to be measured to the DL-UE being associated with DL eNodeB.Subframe is measured can measure the interference that is transmitted in DL-UE from the UL of the UL-UE being associated with adjacent UL eNodeB.Subsequently, can take the second action, this action can be to receive from the subframe of DL-UE and measure at transmission/DL eNodeB.

What have that method 1200 realizes on DL eNodeB determines 1240, but is indifferent in the situation of the possibility that has the interference transmitting from UL, and that makes the relevant possibility of disturbing for DL determines 1270.Can suppose determining and/or can showing that when receiving 1280 interferometry this is definite of DL interference potential.Transmission/DL enodeB can receive the one or more interferometries from exposure/UL eNodeB.Receive interferometry and can form the first action.The second action can be included in transmission/DL eNodeB and respond 1290 one or more interferometries.As previously described, response can comprise and reduces delivering power or will during TDD subframe, at exposure eNodeB, cause subframe and/or the RE in subframe of selection of interference quiet.Power reduces also can be by using wave beam to form to be reduced in the power of the down link signal that exposure eNodeB receives to realize.

Under certain situation, in the situation that transmitting on eNodeB implementation method, even in the situation that relevant UL interference potential certainly determine that 1240 have made, can make determining of relevant DL interference potential.In the situation that three determine 1210,1240,1270 anyly do not make on determining certainly definitely, method can determine that 1210 continue by returning to first.In the situation that determining 1295 at least method realizes on transmissions/DL eNodeB, method also can continue by returning to second definite 1240.

In certain embodiments, the first action of generation 1220 one or more interference message can also be included in exposure/UL eNodeB and measure some channel condition informations.Channel condition information can be derived from transmit as the DL from transmission/DL eNodeB receiving at UL eNodeB.In this type of embodiment, the second action can also comprise one or more interferometries are sent to transmission/DL eNodeB from exposure/UL eNodeB.

Have in some embodiment, the second action of response 1290 interference message can comprise by the scheduling of the DL transmission to for from transmission/DL eNodeB to be changed, and is reduced in the interference of UL eNodeB.The beam pattern that is formed for the DL transmission of radiant power reduction by the direction from transmission/DL eNodeB to exposure/UL eNodeB, also can reduce interference.

In addition, in certain embodiments, in the situation that the interference that request subframe/time slot particular measurement transmits from UL with solution, one or more subframes are measured the DL that can be related at transmission/DL eNodeB and are transmitted and transmit at the UL of exposure/UL eNodeB the specific sub-frame configuring.In a further embodiment, by relatively configuring at the TDD of DL eNodeB and UL eNodeB, the DL that can be defined as at transmission/DL eNodeB transmits and transmits at the UL of exposure/UL eNodeB the specific sub-frame of configuration.This type of embodiment can also comprise that the DL of scheduling from transmission/DL eNodeB to one or more DL-UE transmits to alleviate the interference the specific sub-frame of having carried out subframe measurement.

In the embodiment of the method 1200 realizing on computer program, with the nonvolatile computer of computer readable program code, can use media can reside in transmission/DL eNodeB, exposure/UL eNodeB and/or network-level.In the situation that computer program resides in network-level, the Multi-instance of method can be realized simultaneously.In this type of situation, method can realize, and as three, determines that 1210,1240 is effectively the same with any amount of definite condition in 1270.

Figure 13 provides the example view of mobile device, as the portable radio of UE, travelling carriage (MS), portable radio, mobile communications device, flat board, mobile phone or other type.Mobile device can comprise and is configured to one or more antennas that wireless wide area network (WWAN) access point with base station (BS), eNodeB or other type communicates.Although show two antennas, mobile device can have one to four antenna or more antennas.Mobile device can be configured to use at least one wireless communication standard to communicate, and comprises 3GPP LTE, inserting of microwave whole world interoperability (WiMAX), high-speed packet access (HSPA), bluetooth, WiFi or other wireless standard.Mobile device can use separate antenna or communicate for a plurality of wireless communication standards are used shared antenna for each wireless communication standard.Mobile device can communicate in WLAN (wireless local area network) (WLAN), wireless personal-area network (WPAN) and/or wireless wide area network (WWAN).

Figure 13 also provides the microphone of audio frequency input and output and the diagram of one or more loud speakers that can be used in mobile device.Display screen can liquid crystal display (LCD) screen or the display screen of other type, as Organic Light Emitting Diode (OLED) display.Display screen can be configured to touch-screen.Touch-screen can be used the touch screen technology of capacitive character, resistive or another type.Application processor and graphic process unit can be coupled to internal storage to be processed and display capabilities to provide.Nonvolatile memory port also can be used in as user provides data I/O and selects.Nonvolatile memory port also can be used for expanding the memory capabilities of mobile device.Keyboard can be integrated with mobile device, or be connected to mobile device so that other user's input to be provided with wireless mode.Also can use touch-screen that dummy keyboard is provided.

It should be understood that many functional units of describing have been denoted as module to more clearly emphasize that it realizes independence in this standard.For example, module can be embodied as hardware circuit, ready-made semiconductor or other discrete component such as logic chip, transistor that comprises self-defined VLSI circuit or gate array.Module also can realize in programmable hardware device, as field programmable gate array, programmable logic array, programmable logic device or like that.

Module also can realize to carried out by various types of processors in software.The equal modules of executable code for example can comprise one or more physics or the logical block of computer instruction, and these pieces for example can be organized as object, process or function.But, the executable file of the module of identification is without being physically positioned at together, but can be included in the disparate instruction of diverse location storage, and these instructions, when logically combining, comprise module and realize the described object for module.

In fact, the module of executable code can be single instruction or a plurality of instruction, and even can, on several different code segments, between different programs and across several storage arrangements, distribute.Similarly, operating data can be in this article identification and illustrating in module, and can any applicable form implement and in the data structure inner tissue of any applicable type.Operating data can be collected as individual data collection, or can in diverse location, distribute, and is included in different storage devices and distributes, and can only as the electronic signal on system or network, exist at least partly.Module can be passive or active, comprises for carrying out the agency of required function.

(various technology or its some aspect or part can adopt the program code implemented in tangible media such as floppy disk, CD-ROM, hard disk or any other machine-readable storage media, instruction) form, wherein, while carrying out in program code is written into such as machines such as computers and by it, machine becomes for putting into practice the equipment of various technology.With regard to the program code on programmable calculator is carried out, calculation element can comprise processor, readable medium (comprising volatibility and/or nonvolatile memory and/or storage element), at least one input unit and at least one output device of processor.Can realize or utilize one or more programs of described various technology herein can use API (API), can use again control and like that.This class method can procedure-oriented or the high-level programming language of object realize to communicate with computer system.Yet program can collect when needed or machine language realizes.In any case, language can be compilation or interpretative code, and realizes combination with hardware.This specification refers to that to quoting of " embodiment " or " embodiment " special characteristic, structure or the characteristic in conjunction with this embodiment, described comprise at least one embodiment of the present invention in the whole text.Therefore, at this specification each position occurs " at an embodiment " or " in one embodiment " phrase, not necessarily all refer to same embodiment in the whole text.

While using in this article, for simplicity, a plurality of projects, structural element, component and/or material can be shown in common lists.Yet, these lists should be considered as seeming that each member of list is identified as separately independent and unique member.Therefore, not only its expression based in common group and without the indication of reverse side, the separate member of this type of list is considered as to any other member's of same list true equivalent.In addition, various embodiment of the present invention and example can be in this article with together with its various assemblies alternative, quote.It being understood that this type of embodiment, example and the alternative true equivalent that must not be considered as each other, but will be considered as of the present invention separately with from principal representation.

In addition, the characteristic of description, structure or feature can combine in one or more embodiments in any suitable manner.In the following description, provide many specific details such as example such as material, fastener, size, length, width, shape etc. so that the detailed understanding of embodiments of the invention to be provided.Yet those skilled in the relevant art will recognize, the present invention can put into practice in the situation that not there is not one or more specific detail, or by practices such as other method, assembly, materials.In other example, the structure of knowing, material or operation are not shown specifically or describe, in order to avoid do not obscure aspect of the present invention.

Although above-mentioned example has illustrated principle of the present invention in one or more application-specific, but what it will be appreciated by one of skill in the art that is, in the situation that not exercising invention ability and in the situation that not departing from principle of the present invention and concept, can in the form, use and the details that realize, carry out various modifications.Correspondingly, unless limited by following claim, otherwise, be not intended to limit the present invention.

Claims

1. for reducing the device disturbing between the down link at two enode bs and up link, comprising:

At the measurement module of the first enode b (eNodeB) operation, be configured to measure the channel condition information of the down link from the 2nd eNodeB (DL) transmission of receiving at a described eNodeB;

The message module that communicates with described measurement module and operate at a described eNodeB, be configured to generate interference message, the indication of described interference message needs described the 2nd eNodeB with the beam pattern of the radiant power reducing, one of at least to reduce interference according to scheduling method with in the direction from described the 2nd eNodeB to a described eNodeB, and carry information is to help to reduce described interference; And

The communication module that communicates with described message module and operate at a described eNodeB, is configured to described interference message to be delivered to described the 2nd eNodeB to allow described the 2nd eNodeB to be reduced in the interference that a described eNodeB receives from a described eNodeB.

2. device as claimed in claim 1, wherein said measurement module is by measuring at least one reference signal, the channel condition information that the described DL from described the 2nd eNodeB that measurement is received at a described eNodeB transmits, wherein said at least one reference signal can comprise that channel state information reference signals (CSI-RS) and cell specific reference signal (CRS) are one of at least.

3. device as claimed in claim 1, wherein said interference message comprises that the main eigenvector of quantification of channel of channel measurement, Reference Signal Received Power, estimation and the precoding matrix indicators of code book are one of at least.

4. device as claimed in claim 1, wherein said communication module is also configured to be received in from reference signal (RS) in the described DL transmission of described the 2nd eNodeB and collects relevant metrical information, and wherein said metrical information can be used in the described channel condition information of searching described RS collection and measuring the described DL transmission from described the 2nd eNodeB of receiving at a described eNodeB.

5. device as claimed in claim 1, also comprise the Coordination module that communicates with described measurement module and operate at a described eNodeB, during described Coordination module is configured to the measurement of the described DL transmission from described the 2nd eNodeB that the subscriber equipment (UE) that is associated with a described eNodeB of request receives at a described eNodeB, reduce the delivering power transmitting for up link (UL), to alleviate the impact from the described UL transmission of described UE during measuring.

6. device as claimed in claim 5, in fact similarly the first collection of the resource element (RE) of delivery time and subcarrier is quiet by the described delivering power transmitting for described UL by asking delivery time of the second collection that described UE is the resource element with measuring with described measurement module and subcarrier for wherein said Coordination module, during the measurement of asking described UE to transmit at described DL, reduces the described delivering power transmitting for described UL.

7. device as claimed in claim 1, wherein said communication module is also configured to send time division duplex (TDD) configuration information for a described eNodeB, with allow a described eNodeB when receiving UL information described in the 2nd eNodeB do not transmit DL information and reduce delivering power one of at least.

8. device as claimed in claim 1, wherein said measurement module is carried out a series of measurements that described DL transmits, described message module generates a series of interference message, and described communication module sends the interference message of described series, business load and time division duplex (TDD) configuration to allow described the 2nd eNodeB to adapt in real time, at a described eNodeB, changed by enough frequencies.

9. for reducing the device disturbing between the down link at two enode bs and up link, comprising:

In the backhaul module that transmits enode b (eNodeB) operation, be configured to receive the interfere information from exposure eNodeB, described interfere information provides the information of the channel condition information of relevant down link (DL) transmission from described transmission eNodeB of receiving at described exposure eNodeB;

Communicate with described backhaul module and at the determination module of described transmission eNodeB operation, be configured to the described interfere information received based on described backhaul module, determine to disturb and reduce action; And

The reduction module that communicates with described determination module and operate at described transmission eNodeB, is configured to take described interference to reduce action when described determination module determines that described interference reduction action is suitable.

10. device as claimed in claim 9, wherein said interference reduces action and is included in described transmission eNodeB scheduling DL and transmits subframe to avoid the DL in up link (UL) transmissions of described exposure eNodeB to disturb reception.

11. devices as claimed in claim 10, time division duplex (TDD) configuration information that wherein said backhaul module also receives for described exposure eNodeB transmits for the time scheduling DL not disturbing UL to be transmitted in the reception of described exposure eNodeB.

12. devices as claimed in claim 9, also comprise that the wave beam that communicates with described reduction module and operate at described transmission eNodeB forms module, described wave beam forms block configuration and becomes disturbing UL to be transmitted in the time of the reception of described exposure eNodeB, in the direction from described transmission eNodeB to described exposure eNodeB, with the radiant power reducing, is formed for the wave beam that described DL transmits.

13. devices as claimed in claim 12, wherein said wave beam forms module and uses ZF, least mean-square error (MMSE), signals leakiness noise ratio (SLNR) and Signal Interference and Noise Ratio (SINR) one of at least from described transmission eNodeB, forming the radiant power of described reduction to the described direction of described exposure eNodeB.

14. devices as claimed in claim 9, wherein said transmission eNodeB and described exposure eNodeB can be any eNodeB of high power eNodeB and low-power eNodeB.

15. devices as claimed in claim 9, wherein said communication module is configured to by a series of interference message of enough frequency responses, to allow described transmission eNodeB to adapt in real time in the business load of described exposure eNodeB change and time division duplex (TDD) configuration of change.

16. 1 kinds of up links for reducing two subscriber equipmenies in wireless network transmit with down link reception between the device of interference, comprising:

Comparison module in down link (DL) enode b (eNodeB) operation, is configured to:

Relatively the first time division duplex (TDD) at described DL eNodeB configures and configures at the 2nd TDD of up link (UL) eNodeB, and

Identification is because different UL and DL between configuring from described the 2nd TDD in a described TDD configuration configures the possible interfering subframe forming; And

The request module that communicates with described comparison module and operate at described DL eNodeB, is configured to:

The subscriber equipment (UE) that request receiving transmits with the DL that a described TDD configuration is associated may be carried out the measurement of subframe certain interference in interfering subframe the described of described comparison module identification, and

Reception is measured from the described subframe certain interference of described UE.

17. devices as claimed in claim 16, wherein said request module request is specific to the CQI (CQI) of described possibility interfering subframe.

18. devices as claimed in claim 16, also comprise the receiver module that communicates with described comparison module and operate at described DL eNodeB, and described receiver module is configured to receive the information of relevant described the 2nd TDD configuration.

19. devices as claimed in claim 16, also comprise the scheduler module that communicates with described request module and operate at described DL eNodeB, described scheduler module is configured to measure higher than the described of threshold level and may in interfering subframe, avoid the DL that is dispatched to described UE to transmit in described subframe certain interference.

20. devices as claimed in claim 19, a plurality of subframe certain interference of wherein said scheduler module based on for a plurality of UE are measured, and make scheduling and determine.

21. devices as claimed in claim 16, wherein said request module provides a series of requests that subframe certain interference is measured to adapt in real time the interference rank in described UE change by enough frequencies.

22. 1 kinds of computer programs, comprise that the nonvolatile computer that wherein includes computer readable program code can use media, described computer readable program code is applicable to, through carrying out the instruction to alleviate the method for interference at time division duplex (TDD) environment between realizing for the up link being associated with a plurality of enode bs and down link transmission, comprising:

With respect at least one interferometry, adopt the first action, it is one of at least following that wherein said the first action also comprises:

At up link (UL) eNodeB that is configured for UL reception, generate described at least one interferometry, the information of the measurement that the DL that wherein said at least one interferometry provides the relevant down link of doing for oneself (DL) of receiving at described UL eNodeB to transmit the DL eNodeB of configuration transmits

At described DL eNodeB, receive described at least one interferometry from described UL eNodeB, and

By described DL eNodeB, to the DL-UE request subframe being associated with described DL eNodeB, measured, described subframe is measured the interference that is transmitted in described DL-UE from the UL of the UL-UE being associated with described UL eNodeB; And

With respect to described at least one interferometry, adopt the second action, it is one of at least following that wherein said the second action also comprises:

Described at least one interferometry is sent to described DL eNodeB from described UL eNodeB,

At described at least one interferometry of described DL eNodeB response, and

At described DL eNodeB, receive from the described subframe of described DL-UE and measure.

23. computer programs as claimed in claim 22, wherein:

Described the first action comprises described at least one interference message of generation, and generate described at least one interference message and be also included in the channel condition information that described UL eNodeB measures the described DL transmission from described DL eNodeB of receiving at described UL eNodeB, and

Described the second action also comprises described at least one interferometry is sent to described DL eNodeB from described UL eNodeB.

24. computer programs as claimed in claim 22, wherein:

Described the first action is included in described DL eNodeB and receives described at least one interferometry from described UL eNodeB, and

Described the second action also comprises described at least one interference message of response, described at least one interference message of response also comprises that the scheduling transmitting by the DL to from described DL eNodeB is changed and with the radiant power reducing, is formed for beam pattern that DL transmits one of at least in the direction from described DL eNodeB to described UL eNodeB, is reduced in the interference of described UL eNodeB.

25. computer programs as claimed in claim 22, the DL that wherein said subframe measurement is related at described UL eNodeB transmits and transmits at the UL of described UL eNodeB the specific sub-frame of configuration.

26. computer programs as claimed in claim 25, also comprise that the DL being defined as at described DL eNodeB transmits and transmit at the UL of described UL eNodeB the described specific sub-frame of configuration by comparing time division duplex (TDD) configuration at described DL eNodeB and described UL eNodeB.

27. computer programs as claimed in claim 26, also comprise that the DL of scheduling from described DL eNodeB to described DL-UE transmits to alleviate the interference during carrying out the described specific sub-frame of described subframe measurement.

28. computer programs as claimed in claim 22, the described nonvolatile computer that wherein includes computer readable program code can use media to reside in described DL eNodeB, described UL eNodeB and network level one of at least.